harmony, peace, conciliation, to be on good terms with, kindly, mild
咊 centers on harmonious interaction: peace, mildness, and being on good terms with others. The conciliation sense extends naturally from that idea of smoothing relations.
咊 is a variant form of 和, combining 口 (mouth) and 禾 (grain). The exact historical development is uncertain, but it likely expresses harmony through speech or agreement, similar to 和.
A mouth 口 beside grain 禾 suggests people sharing food and speaking peacefully together, creating harmony and mild relations.
For ワ, imagine a peaceful gathering where everyone says 'waa' in wonder at the harmony: waa -> ワ, and the mild atmosphere keeps everyone on good terms.
—